Manifold Main Water

12 On most manifolds there are but two such ports in the main water crossover—one for the heater hose fitting and one for the gauge sender. To solve the problem of needing three ports with EFI some people use the late-model Mustang metal heater tube (with ECT fitting in it). Another option, if you have a 1⁄8-inch gauge sender, is to drill and tap the top of the heater elbow to relocate the gauge sender. We did this on our Factory Five Cobra build many years ago with no issues.